Incorporation of Sliding Mode Control into Current and Direct Torque Controllers for Induction Motor Drives

In this paper, applications of discrete-time sliding mode control (DSMC) method to both current control and direct torque control (DTC) of induction motor (IM) drives are presented. The proposed control law is derived using Lyapunov analysis and sliding mode control methodology. The current controller parameters are determined by an analytic procedure carried out in discrete domain. The performance of the current control algorithm is simulated in field oriented control (FOC) scheme using a slow sampling time and verified by experiments conducted on high-power prototype IM drive system. Moreover, the proposed control scheme is extended to a DTC of IM and its potential is demonstrated by computer simulations. Finally, advantages and several distinct features of the proposed control method are highlighted. Copyright (c) 2012 Praise Worthy Prize S.r.l. - All rights reserved.